Dataset Information

A new deep-sea species of Flabelligena from off the South Orkney Islands, the Southern Ocean.

ABSTRACT: Background:A new acrocirrid species, Flabelligena hakuhoae sp. nov., is described from off the South Orkney Islands, the Southern Ocean. Individuals of the new species were collected by rock dredging, 2036-2479 m in depth. New information:The new species can be distinguished from its congeners by the number of branchiae, position and length of paired ventral large papillae and length of body papillae.

SUBMITTER: Jimi N

PROVIDER: S-EPMC7295819 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Publications

A new deep-sea species of <i>Flabelligena</i> from off the South Orkney Islands, the Southern Ocean.

Jimi Naoto N Ogawa Akito A Hiruta Shimpei F SF Ikehara Minoru M Imura Satoshi S

Biodiversity data journal 20200608

<h4>Background</h4>A new acrocirrid species, <i>Flabelligena hakuhoae</i> <b>sp. nov.</b>, is described from off the South Orkney Islands, the Southern Ocean. Individuals of the new species were collected by rock dredging, 2036-2479 m in depth.<h4>New information</h4>The new species can be distinguished from its congeners by the number of branchiae, position and length of paired ventral large papillae and length of body papillae. ...[more]

PMID: 32565682

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Project description:Since the first discovery of deep-sea hydrothermal vents along the Galápagos Rift in 1977, numerous vent sites and endemic faunal assemblages have been found along mid-ocean ridges and back-arc basins at low to mid latitudes. These discoveries have suggested the existence of separate biogeographic provinces in the Atlantic and the North West Pacific, the existence of a province including the South West Pacific and Indian Ocean, and a separation of the North East Pacific, North East Pacific Rise, and South East Pacific Rise. The Southern Ocean is known to be a region of high deep-sea species diversity and centre of origin for the global deep-sea fauna. It has also been proposed as a gateway connecting hydrothermal vents in different oceans but is little explored because of extreme conditions. Since 2009 we have explored two segments of the East Scotia Ridge (ESR) in the Southern Ocean using a remotely operated vehicle. In each segment we located deep-sea hydrothermal vents hosting high-temperature black smokers up to 382.8°C and diffuse venting. The chemosynthetic ecosystems hosted by these vents are dominated by a new yeti crab (Kiwa n. sp.), stalked barnacles, limpets, peltospiroid gastropods, anemones, and a predatory sea star. Taxa abundant in vent ecosystems in other oceans, including polychaete worms (Siboglinidae), bathymodiolid mussels, and alvinocaridid shrimps, are absent from the ESR vents. These groups, except the Siboglinidae, possess planktotrophic larvae, rare in Antarctic marine invertebrates, suggesting that the environmental conditions of the Southern Ocean may act as a dispersal filter for vent taxa. Evidence from the distinctive fauna, the unique community structure, and multivariate analyses suggest that the Antarctic vent ecosystems represent a new vent biogeographic province. However, multivariate analyses of species present at the ESR and at other deep-sea hydrothermal vents globally indicate that vent biogeography is more complex than previously recognised.

Dataset Information

A new deep-sea species of Flabelligena from off the South Orkney Islands, the Southern Ocean.

Publications

A new deep-sea species of <i>Flabelligena</i> from off the South Orkney Islands, the Southern Ocean.

Similar Datasets

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